Pipe



Patented July 3, 1923.-

AUGUSTUS M. SUNDERS, OF MCKEESPORT, PENNSYLVANIA, ASSIGNOR. TO NATIONAL TUBE COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF NEW JERSEY` PIPE.

application mea my 7,

To all whom t may concern.'

Be it known that I, AUGUSTUS M. SAUNn- ERs, a citizen of the United States, and resident of McKeesport, in the county of Allegheny and State of Pennsylvania, have 1nvented certain new and useful Improvements in Pipes, of which the following is a specification.

This invention ,relates to wrought metal pipes and while not limited thereto relates particularly to steel line pipes, and has for its principal object the provision of awrought metal pipe having an integral nipple or coupling at one end and .a male threaded portion terminating in an integral abutting flange on the other end adapted to be threaded into the nipple orbcoupling of the next adjoining pipe. f

Heretofore wrought metal pipes have been made having both ends threaded and separate coupling members have been used to connect the pipes together. In the present invention the coupling is made an integral part of the pipe, making a stronger and tighter joint at a less cost. One embodiment of my inventionis Illustrated in the accompanying drawings, in which Figure 1 is an elevation of a series of connected pipes.

the pipes of'Figure 1.

Referring particularly to the drawings, v the numeral 2 designates the lengths or sections of pi le, which are provided with. a male threa ed end 3 terminating in an integral abutting flange or shoulder 4, formed by upsetting the pipe body outwardly without changing the thickness of the pipe wall above or below the shoulder flange, or changing the interior diameter of the pipe.

The other end of each of the pipe sections 2 is provided with an integral internally threaded coupling member 5 formed by expandin and upsetting the end of the pipe outwar ly until the interior diameter o t e coupling is sufficiently large to permit the Figure 2 is a sectional elevation throughv t same internal diameter throughout its length 1921. Serial N10. 483,023.

entrance of thel male threaded portion 4 of the next adjoining pipe.

- The coupling 5 is considerably thicker than the remainder of the pipe wall, and, therefore, addsto the strength of the pipe.

The threads on both the male end 3 and in the coupling member 5 are tapered so as to form a. tight joint.

If desired, a gasket 6 may be inserted between the end of the coupling 5 and the face of the shoulder 4 to insure a leak-proof joint.

The length of themale end of the pipe sections is preferably shorter than the length of the coupling 5, so that the pipes may be threaded together until the coupling engages the face of shoulder 4. f

It will be noted that a pipe constructed in accordance with my invention has a substantially equal diameter throughout its length, since the coupling is expanded so that its inside diameter is equal to the outside diameter of the male end.

I claim A A wrought metal pipe having a male thread on one end, an integral flat faced shoulder flange formed at the rear end of said male thread by u setting the wall of the pipe outwardly on y, said Harige being adapted to form a bearing for a. gasket, and an intergral threaded coupling portion formed on the opposite end of said pipe, said coupling portion being formed by upsetting and expanding the pipe wall 4outwardly until said coupling portion has a substantially thicker wall than said pi and an inner diameter equal to the outer ameter of said male threaded end, said male end being of shorter lengththan said coupling member, and said pipe being of the with the exception of the expanded coupling portion, substantially as and for the purpose described.

In testimony whereof, I have hereunto set 90 my hand.

' AUGUSTUS M. SAUNDERS, 

